someone at ssk did this too, that's where i first heard about it
http://www.sskusers.net/support/showthread.php?t=203
i found that if you leave the stylus in the dye it only blackens the tip and the part that sticks out the battery cover. I also have put an invisible shield over it with excellent results, and eliminates chances of the dye rubbing off (OP at ssk said it began rubbing off after a while)